Question

draw the circuit diagram of a half wave rectifier and explain the working of the circuit write short note on LED

Answer 1

Hey !!

First part of your question

Draw the circuit diagram of a half wave rectifier and explain the working of the circuit ?

ANSWER

               WORKING :- If an alternating voltage is applied across a diode in series with a load, a pulsating voltage will appear across the load only during that half-cycle of the AC input during which the diode is forward biased.

    Therefore, in the positive half-cycle of AC input there is current through the load resistor RL and we get an output voltage whereas there is no output during the negative half cycle. Thus, the output voltage is restricted to only one direction and is said to be rectified.

SECOND PART OF YOUR QUESTION

    Short note on LED ?

ANSWER

                                 LED

• Light emitting diode or LED is most widely used semiconductor diodes among all the different types of semiconductor diodes available today.
• It emits visible light or invisible infrared light when forward biased.
• The LEDs which emit invisible infrared light are used for remote controls.
• LED is light source that uses semiconductors and electroluminescene to create light.
• There are two main types of light emitting diodes : LED and OLED
• LED is different than EL lamp as it uses a small semiconductor crystal with reflectors and other parts to make light brighter and focused in single point.
• OLED is similar to EL lamp, as it uses flat sandwich of materials but is different than LED and EL lamp as it uses carbon molecules in layer than emits light.
• In this, diode in forward bias will make electrons and holes to move fast across the junction and helps in combing constantly by removing one another.
• Electrons which move from n-type to p-type silicon will combine with holes and disappears leading to atom with more stability giving little burst of energy.
• Recombination of electrons and holes in depletion region decreases  the width of the region which allows more charge carries to cross the p-n junction.
• Here, some of the charge carries from p-side and n-side will cross the p-n junction before they recombine in depletion region.

GOOD LUCK !!